Re: [ECOS] PPP/GPRS problems

[Matt Jerdonek <maj1224 at yahoo dot com>]

You might also consider turning on ACCM negotiation. 
We had similar problems that also appeared as FCS
issues.

http://sourceware.org/ml/ecos-discuss/2004-12/msg00041.html

We submitted a patch for this issue a while back. 
Nick, can you please look at it again?  I don't
believe it was ever committed.

http://sourceware.org/ml/ecos-patches/2004-12/msg00004.html

-- Matt

--- Nick Garnett <nickg@ecoscentric.com> wrote:
> "Deak, Ferenc" <feco@stp.hu> writes:
> 
> > Hello,
> > 
> > I'm trying to create a PPP connecton with a GPRS
> modem. During
> > cyg_ppp_wait_up I'm getting random messages
> something like
> > 
> > ppp0: bad fcs 95fa, pkt len 25
> > ppp0: bad fcs d70a, pkt len 20
> > ppp0: no compressor for [15 3 29], 3
> > ppp0: no compressor for [1a 4 8], 4
> > ppp0: no compressor for [18 4 8], 4
> > ppp0: bad protocol 600
> > 
> > (if I remember correctly sometimes there is no
> "bad protocol" or "no
> > compressor" messages only "bad fcs") But after it,
> the server assigns an
> > IP address to the device, which I can see in the
> routing tables and in
> > the interface statistics. But after this I'm
> getting only error messages
> > something like: "ppp0: bad fcs 5049, pkt len 33",
> when I'm trying to
> > connect to a host.
> > 
> > The device has no hardware flow control lines. Is
> there anybody who can
> > assure me, that PPP have to work without hardware
> flow control?
> > 
> > I've tested the modem under linux, with flow
> control, without flow control, and
> > xonxoff settings, and it was good with every
> setup...
> > 
> > The version of Ecos is almost the latest CVS.
> > 
> 
> PPP will certainly work without hardware flow
> control, but only if you
> enable software flow control. It really needs flow
> control of some
> sort to work, but that obviously depends on the
> modem being capable of
> being configured to use software flow control too.
> 
> You might also try reducing the baud rate and see if
> that makes a
> difference.
> 
> It may also be worth testing eCos against a Linux
> host and see whether
> you get the same behaviour.
> 
> All of this should give you some ideas about where
> things are going
> wrong.
> 
> -- 
> Nick Garnett                                    
> eCos Kernel Architect
> http://www.ecoscentric.com                The eCos
> and RedBoot experts
> 
> 
> -- 
> Before posting, please read the FAQ:
> http://ecos.sourceware.org/fom/ecos
> and search the list archive:
> http://ecos.sourceware.org/ml/ecos-discuss
> 
> 


		
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